code: def __str__(self):
      try:
          current_decl = self.args[1]
          filename = current_decl.coord.file
          linenum = current_decl.coord.line
          prefix = "%s:%d: " % (filename, linenum)
      except (AttributeError, TypeError, IndexError):
          prefix = ""
      return "%s%s" % (prefix, self.args[0])
  
file_path: catboost/contrib/python/cffi/py2/cffi/error.py
label_desc: Use image node_id 1 for calling the CDefError obj's underlying member method code with example usage: obj.__str__() and returns: unknown